F&F STR-21 Manual page 6

Mounting
1. Disconnect power supply.
2. Mount the controller on a rail or in a distribution box.
3. Connect the power supply wires to terminals 1-2 as marked.
A group of controllers working with a common central
control must be supplied from the same phase, e.g. L1
only.
4. Select the control option (L or N pulse). Connect the local con-
trol and central control switches, respectively, to the control
terminals according to the function and to the selected wire
(according to the selected control option - L or N).
All control inputs of controllers working individually or in
a group must have a common control pulse option - all
controlled from one phase, e.g. from phase L1 only; or
all from N.
When selecting the control option from phase L, the
same phase must be connected to the control inputs as
to the power supply, e.g. only phase L1.
Connecting different phases to the control inputs of the
controllers, e.g. L1 and L2, or phase L and "zero" N may
cause incorrect operation of the system and lead to an
electrical short in the installation and destruction of the
controllers.
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